Non Medical One size fits most. Made from 100% cotton with adjustable elastic. These green-tea aromatherapy infused face masks both protect and relax. 4 designs: blue quatrefoil, light blue dashes, tan geometric, and green chevron. 3 layers of cotton for proper protection. Infused throughout with silver ion fiber on the outside layer, which provides the mask with antimicrobial technology that resists microorganism growth. The Tea-infused layer is the inside layer (closest to the face). Green tea polyphenol is mixed with the yarn during the manufacturing process and weaved together. Green tea is an aromatherapy scent that promotes relaxation. 4 patterns of non-medical fabric masks Machine washable. Wash once before first use, and after every use. Do not bleach. Adjustable strap for best fit.